Modelling the management of forest ecosystems: importance of wood decomposition

Scarce and uncertain data on woody debris decomposition rates are available for calibrating forest ecosystem models, owing to the difficulty of their empirical estimations. Using field data from three experimental sites which are part of the North American Long-Term Soil Productivity (LTSP) Study in south-eastern British Columbia (Canada), we developed probability distributions of standard wood stake mass loss of Populus tremuloides and Pinus contorta. Using a Monte Carlo approach, 50 synthetic decomposition rate values per debris type were used to calibrate the ecosystem-level forest model FORECAST. Significant effects of uncertainty of pine stake mass loss rates on estimated tree growth were found, especially in moderately managed forests, as estimations of available nitrogen were affected. Consequently, our work has shown that projections of tree growth under management conditions depend on accurate estimations of woody debris decomposition rates, and special effort should be done in create reliable databases of decomposition rates for their use in tree growth and yield modelling

How Much Is Enough? Distribution and Protection Status of Habitats in the Adirondacks

One of the most enduring debates in the Adirondacks concerns how much protected land we need in the Park, and the balance of human needs versus environmental protection. Using some newly available resources, we provide information to contribute to the discussion. The recently competed Northeast Terrestrial Habitat Classification System and associated map provides a consistent habitat classification system across the entire northeast (West Virginia to Maine), and a freely available digital map that can be used in GIS analyses. We used this map to examine habitat types and their distribution within the Adirondacks, as well as their relationship to terrestrial Adirondack vertebrate species, especially those that are of conservation concern. To our knowledge, this is the first time such a large number of states and jurisdictions have chosen to create a common language of habitat types, it is the first time we can examine habitats on large states as opposed to and cover, and it is the first time we can visualize these habitats and ask questions about their distributions. We hope it will help to address some of the important questions often raised